Forceps



1951 R. o. CHRISTENSEN 2,563,920

FORCEPS Filed March 29, 1948 FIG. 4

. 1X1 'EYTOR. RALPH O. CHRISTENSEN Patented Aug. 14, 1951 UNITED STATES PATENT OFFICE FonoEPs Ralph o. Christensen, Edina, Minn.

. Application March 29, 1948, Serial No. 17,631

This invention relates to an improved forceps for extracting teeth of people.

. An object of the present invention is to provide certain new" and useful improvements whereby the forceps maybe conveniently manipulated in one hand thus leaving the other 1 Claim. (Cl. 32-62) 20 to the handle l2 intermediate its ends. An

hand free to do other things necessary to attend provide forceps, the jaws of which will engage a,

tooth with sufficient gripping surface so that the tooth will be easily extracted from thejaw of a patient.

A still further object of the invention is to simplify the construction and operation of forceps, and to construct and change the parts such a manner as to produce a very strong and a durable forceps. With these and other objects in view, the present invention consists in the combination and arrangement of parts, as will be hereinafter more fully described, shown in the accompanying drawings and particularly pointed out 1 in the appended claim, it being understood that changes in the form, proportion, and size may be made, within the scope of the claim, without;

departing from the spirit of the invention.

Figure 1 15a view in side elevation of the novel forceps in its closed position. Figure 2 is a view in side elevation of th novel forceps in its open position. Figure 3 is a sectional view on line 3- 3 of Figure 2 looking in the direction of the arrows.

Figure 4 is a sectional view of the movable and fixed jaws of the forceps shown in Figure l', disclosing the longitudinal curved groove in each of the jaws. Like characters of reference indicate corresponding parts in each of the several figures of the drawings.

The forceps l0 includes a handle l2 terminat ing in a stationary jaw l4.

An ear I6 projects from the inner faceof the handle I! intermediate its end while asecond ear l8 projects from the inner face of handle l2 adjacent a fixed or stationary jaw l4. A second handle shorter than'handle I2 is formed with bifurcations 24 and 26. The bifurcations and 26 straddle the car 16 and a pivot pin "extends through apertures in the bifurcations 24 and 26 and the ear It to pivotally mount the handle extension 22 on handle 20 extends beyond the pivot or fulcrum 28 for handles I2 and 20. A movable jaw 30 is provided with bifurcations at 34 which straddle the ear l8 on handle l2 and a pivot pin 36 extends through apertures in the bifurcations and car It for pivotally mounting the jaw 30 on the handle l2 opposite the fixed jaw l4 on handle l2. A link 38 connects the extension 22 of handle 20 which extends beyond the pivot or fulcrum 28 and the rear portion of the movable jaw 30.

The jaws l4 and 30 are normally held in their open position by means of a spring 40 disposed longitudinally between the inside face of the handles l2 and 2D in the rear of the pivotal connection 28 between the handles I2 and 20, see Figure 2 of the drawings. The forceps II) can be manipulated without employment of the spring 40 and the spring 40 is generally eliminated as an element of the forceps i0.

The jaws l4 and 30 are each provided with a longitudinal curved groove 42 which extends from the tip end of the jaws i4 and 30 to the recessed portions 44 and 46 formed in the handle l2 and in the movable jaw 30 respectively.

When the handle 20 is moved upwardly (see Figure l) the handle 20 pivots about its fulcrum 28 and extension 22 moves downwardly toward the handle 12.. When the extension 22 of handle 20 is moved toward the handle I2, link 38 actuates the movable jaw 30 to open position, see Figure 2. When the jaws I4, 30 are separated as shown in Figure 2 of the drawings, the forceps i0 can be inserted in the mouth of a person and the jaws I4 and 30 can then be moved to engage a tooth by pressing the handle 20 toward the handle i2. The recessed portion 46 in the movable jaw 30 and the recessed portion 44 in the handle l2 being opposite each other provide space between the jaws for the upper enlarged portion of a tooth and at the same time permit the jaws I4 and 30 to engage the tooth at the exact position for quick and satisfactory extraction of the tooth from a persons jaw.

The forceps disclosed in Figures 1 and 2 of the drawings is used for the extraction of the upper anterior teeth. It is my intention to provide a set of six forceps which would be utilized for the extraction of the different teeth from the jaws of a person. Since the teeth of a person are positioned at different angles in the jaw with respect to the mouth, it will be necessary to utilize different shaped and length jaws with the six forceps so that all the teeth can be easily extracted from the jaws of a person. There are forceps each for the upper anterior teeth, upper bi-cuspid teeth, lower anterior and bi-cuspid teeth, lower molars, upper right molars, and upper left molars.

The curved longitudinal groov 42 in the movable jaw 30 and the fixed jaw M will fit the curvature of the teeth to permit a large gripping surface to engage a tooth which will facilitate the extraction of a tooth.

The forceps while utilizing the link connection 38 which connects the extension 22 of handle 20 extending beyond the fulcrum 28 of the handles l2 and 20 with the rear portion of the pivotal or movable jaw 30 produces a toggle motion to force the movable jaw 30 toward the stationary jaw I4 with great power which insures an efllcient and Forceps comprisin a pair of levers of different .lengths pivotally interconnected at respectively intermediate points thereof, each lever having a hand-gripping rear portion, afixed jaw integrally formed on the forward end portion of the longer of said levers and disposed a substantial distance forwardly of the lever pivot, the shorter lever terminating at its forward end in slightly spaced relation to the lever pivot, a movable jaw pivoted on said longer lever intermediate the forward end thereof and the lever pivot point, andhaving a laterally outwardly extending portion to form a bellcrank, and a toggle link pivotally connected at one end to said outwardly disposed portion or said movable jaw and pivotally connected at its other'end to the'forward end of the shorter lever, to form the sole means for actuating said movable jaw, all of said pivots being completely restricted against any rectilinear movement whatever.

RALPH O. CHRISTENSEN.

' REFERENCES 0112121) Number .Name Date 8,351 Burch Sept. 9, 1851 1,676,942 Ogden- July 3, 1928 2,222,744 Gallien Nov. 26, 1940 

